Dtscalibration

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* Solved xlim in subplots of plot_residuals_reference_sections funciton
* Solved YAML deprecation related problems
* Introduced new approach for double ended calibration, with a different Cfor the forward and backward channel
* First code added for time variant asymmetric attenuation, such as connectors.
* First code added for matching sections

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* Set alpha and or gamma to known value, with corresponding variance.
* Bug in computation of the weights for single and double-ended calibration
* Added notebook about merging two single ended measurements
* Added example notebook on how to create a custom datastore
* Added notebook examples for loading in data from the different manufa..
* Loading AP Sensing files and tests
* Loading Sensortran files

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* Ensure order of dimension upon initialization of DataStore. Resamplingwould lead to issues
* Bug in section definition (reported by Robert Law)
* Rewritten calibration solvers to align with article of this package
* Removed old calibration solvers
* New possibilities of saving and loading large DataStores saved to multiplenetCDF files

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* Use twine to check if the compiled package meets all the requirements of Pypi

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* Use twine to check if the compiled package meets all the requirements of Pypi

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* Major bug fix version.
* More flexibility in defining the time and space dimensions
* Fixed unsave yaml loading
* Added support for Silixa 7 files
* Start using `__slots__` as it is something new
* xarray doesn't have the attribute `._initialized` anymore. Rewritten teststo make more sense by checking the sum of the Stokes instead.
* Support for double ended Sensornet files and tests
* Bug fixing